Given a pattern and a string str, find if str follows the same pattern. Here follow means a full mat…

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside …

Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = &…

Given an input string, reverse the string word by word. A word is defined as a sequence of non-space…

Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array …

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignori…

Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. Yo…

Given a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘, return the l…

Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the inpu…